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Pensions (Tables)
9 Months Ended
Dec. 31, 2014
Pensions [Abstract]  
Pensions
Pension cost included the following components:

  
Three months ended
December 31,
  
Nine months ended
December 31,
 
  
2014
  
2013
  
2014
  
2013
 
Service cost
 
$
0.1
  
$
0.2
  
$
0.4
  
$
0.5
 
Interest cost
  
3.3
   
3.2
   
9.8
   
9.7
 
Expected return on plan assets
  
(4.2
)
  
(3.9
)
  
(12.6
)
  
(11.8
)
Amortization of unrecognized net loss
  
1.4
   
1.6
   
4.2
   
4.7
 
Net periodic benefit cost
 
$
0.6
  
$
1.1
  
$
1.8
  
$
3.1